package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RequestMapping("/common")
@RestController
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;


    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
//        log.info("");
        //获得原本路径
        String filename1 = file.getOriginalFilename();
//          截取到原本文件的后缀名称 suff
        String suff = filename1.substring(filename1.lastIndexOf("."));

        //通过UUID随机生成文件的新名称
        String filename = UUID.randomUUID().toString() + suff;
        File dir = new File(basePath);

        if (!dir.exists()) {
            //文件不存在的话  创建新的文件
            dir.mkdirs();
        }

        //将临时文件转存到指定位置
        try {
            file.transferTo(new File(basePath + filename));
        } catch (IOException e) {
            e.printStackTrace();
        }


        return R.success(filename);
    }

    /**
     * 文件下载
     *
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //输入流
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出流
            ServletOutputStream ops = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                ops.write(bytes, 0, len);
                ops.flush();

            }
            fileInputStream.close();
            ops.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
